Answer:
65 percent
Step-by-step explanation:
Given that,
Value of investment:
= Shares purchased × Price per share
= 500 × $33
= $16,500
Initial margin = Cash ÷ Investment
 = $10,725 ÷ $16,500
 = 0.65 or 65% 
Therefore, the initial margin requirement on this particular stock is 65 percent.